.container{
    display: flex;
    width: 50%;
    height: 500px;
    background-color: lightblue;
    margin: 10px;
}

.container > div{
    height: 120px;
    width: 120px;
}

.container > div:nth-child(2n + 1){
    background-color: lightsalmon;
}

.container > div:nth-child(2n){
    background-color: lightgreen;
}

.container:nth-child(1){
    flex-wrap: wrap;
    justify-content: space-between;
    align-content: flex-start;
}

.container:nth-child(2){
    flex-direction: row-reverse;
    flex-wrap: nowrap;
}

.container:nth-child(2) > div:nth-child(2n + 1){
    flex-grow: 3;
    flex-shrink: 3;
}

.container:nth-child(2) > div:nth-child(2n){
    flex-grow: 1;
    flex-shrink: 1;
}